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Definition

Primary Production Analysis is the specific workflow and report template on Primary Well & Reservoir Performance IndicatorsSpecific Production Analysis workflow with basic Production Performance Metrics.


Application

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Sample Cases
First guess on redevelopment opportunitiesNatural Depletion Reservoir
Identify and prioritise surveillance opportunitiesWaterflood Sector Analysis
Assess current production performance:Oil Producer Analysis
  • current status and trends of reservoir depletion against expectations

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  • current status and trends of

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  • waterflood efficiency against expectations

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  • comparative analysis of performance of different wells or

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Technology

PRIME analysis is built around production data against material balance and require current FDP volumetrics, PVT and SCAL models. 

PRIME includes well-by-well diagnostics and gross field diagnostics, but may be extended to sector-by-sector diagnostics.

Metrics

PRIME includes the following metrics:

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Decline Curve Analysis

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qo1, qliq1, qinj1,Yw, GOR, VRR, Pe vs time

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qo1, qliq1, qinj1, Yw, GOR, VRR + Pe vs RF

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Yw vs Yw_MatBal + Yw vs qt

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GOR vs GORMatBal + GOR vs qt

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Injection Efficiency Diagnostics

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IPR Pwf , VLP Pwf vs q

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Productivity Index Diagnostic

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Models

VRR vs RF

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VRR=\frac{B_w \, q_{WI}}{B_w \, q_W + B_o \, q_O + B_g (q_G - R_s q_O)}=\frac{B_w \, q_{WI}}{B_w \, q_W + B_o \, q_G - B_g (Y_g - R_s) q_O}

PIR vs Yw

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{PIR=\frac{Q_o}{Q_i};} {\qquad} {\gamma}=\frac{Q_w}{Q_w + Q_o} {\quad \Rightarrow \quad} \frac{Q_w+Q_o}{Q_w}=\frac{1}{\gamma} {\quad \Rightarrow \quad} \frac{Q_o}{Q_w}={\frac{1}{\gamma}-1}  {\quad \Rightarrow \quad} \frac{Q_o}{Q_w}=\frac{1-\gamma}{\gamma}

IPRw vs Pe

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PI=\frac{Q}{P_e - P_{wf}} {\quad \Rightarrow \quad} P_{wf}=P_e - \frac{1}{PI}Q

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titleВывод уравнения PIR
LaTeX Math Block
Q_w=\frac{\gamma}{1-\gamma}{Q_o}
LaTeX Math Block
VRR=\frac{B_w Q_i}{B_w Q_w + [ B_o - B_g (GOR - R_s ) ] Q_o}=\frac{B_w Q_i}{ [ B_w \frac{\gamma}{1-\gamma} + [ B_o - B_g (GOR - R_s ) ] ] Q_o }
LaTeX Math Block
PIR=\frac{Q_o}{Q_i}={ \frac{1}{VRR} }*{ \frac{1}{ \frac{\gamma}{1-\gamma} +  [ \frac{B_o}{B_w} - \frac{B_g}{B_w}(GOR - R_s) ] } }
LaTeX Math Block
PIR=\frac{Q_o}{Q_i}={ \frac{1}{VRR} }*{ \frac{1-\gamma}{ \gamma +  [ \frac{B_o}{B_w} - \frac{B_g}{B_w}(GOR - R_s) ] } }

Sample Case

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Fig. 1. Decline Curve Analysis

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  • well groups

  • first guess on areal distribution of recovery against expectations



AdvantagesLimitations
Fast TrackShort production forecasts only
Minimal input dataSometimes incapable to forecast
Straightforward analysisHigh level hint of reserves distribution only
Fair hints for underperforming wells and sectors


See Also

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Petroleum Industry / Upstream /  Production / Subsurface Production / Field Study & Modelling / Production Analysis

[ Production Performance Indicators @model ]

[ Dynamic Data Statistical Correlation ]

[ Well Location and Flow Rate Map ]

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groupsofoil

Введение

История добычи

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Карты разработки

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Падающая добыча

Стационарная добыча

Стационарная добыча это режим в котором давление на линии отбора поддерживается постоянным за счет газовой шапки, аквифера или закачки в нагнетательные скважины.

Растущая добыча

Динамика пластового давления

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Снижение пластового давления приводит к снижению пористости и проницаемости коллектора, что приводит к потере продуктивности и снижению дебита сквжаины.

Снижение пластового давления ниже давления насыщения приводит к выделению газа в призабойной зоне и потере продуктивности скважин по жидкости за счет более высокой мобильности газа и за счет дроссельного охлаждения, что в итоге приводит к снижению дебита скважины.

Диагностические графики анализа добычи NDR

q1o vs RF

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q_{1o} = \frac{\sum Q_o }{ \sum {t_o}}
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RF = \frac{\sum_t Q_o }{V_{STOIIP}}

Yw vs RF 

Рис. 1. График обводненности от КИН

Yw vs Yw_FF

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\gamma_w=\frac{1}{1 + \frac{K_{ro}}{K_{rw}} * \frac{\mu_w}{\mu_o} * \frac{B_w}{B_o}}

Pe vs RF 

IPRo vs Pe

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P_{wf}=P_e - \frac{1}{J_{PI}} q_o

JPI vs dp

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J_{PI}=\frac{q_o}{P_e - P_{wf}} 

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